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This is a reland of 37c3e0b6
Original change's description:
> Add Dictionary API to base::Value
> 
> This change introduces |FindKey|, |FindKeyOfType|, |SetKey|, |DictEnd| and
> |DictItems| to base::Value. These methods are part of the new API proposal and
> abstract away the pointer based underlying storage of Dictionary Values.
> 
> Bug: 646113
> Change-Id: I09150f3b2fd47e24074caa50a30a058fc4f558a7
> Reviewed-on: https://chromium-review.googlesource.com/561682
> Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
> Reviewed-by: Brett Wilson <brettw@chromium.org>
> Reviewed-by: Vladimir Levin <vmpstr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#486709}

TBR=brettw@chromium.org

Bug: 646113
Change-Id: I76ee2149f18da83474a16586ee77b8e6be185814
Reviewed-on: https://chromium-review.googlesource.com/571805Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486756}